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<article id="post-SpringBoot教程" class="article article-type-post " itemscope itemprop="blogPost">
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      SpringBoot教程
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        <h1 id><a href="#" class="headerlink" title></a></h1><p>详解SpringBoot</p>
<span id="more"></span>

<h2 id="SpringBoot教程"><a href="#SpringBoot教程" class="headerlink" title="SpringBoot教程"></a>SpringBoot教程</h2><blockquote>
<h3 id="补充：关于注解"><a href="#补充：关于注解" class="headerlink" title="补充：关于注解"></a>补充：关于注解</h3><p>注解其实是特殊的接口</p>
<p>注解是如何发挥作用的</p>
<p><a target="_blank" rel="noopener" href="https://zhuanlan.zhihu.com/p/399089916">Java中的注解是如何发挥作用的？ - 知乎</a></p>
<p>接口的定义形式如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">&gt;<span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">ClassConditional</span> </span>&#123;</span><br><span class="line">   String[] value();</span><br><span class="line">&gt;&#125;</span><br></pre></td></tr></table></figure>

<p>注解的接口定义形式如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">&gt;<span class="keyword">public</span> <span class="meta">@interface</span> ClassConditional &#123;</span><br><span class="line">   String[] value();</span><br><span class="line">&gt;&#125;</span><br></pre></td></tr></table></figure>

<p>那么问题——为什么注解的属性都需要带一个小括号？很好理解了</p>
<ul>
<li>==注解是特殊的接口，接口中只有方法，所以注解把方法当作属性了而已，即注解中的属性其实还是方法==</li>
</ul>
<p>疑问——注解上面加Conditional注解是干嘛？</p>
</blockquote>
<h3 id="0、前言"><a href="#0、前言" class="headerlink" title="0、前言"></a>0、前言</h3><p>javase：OOP</p>
<p>mysql：持久化</p>
<p>html+css+js+jquery+框架：视图层</p>
<p>javaweb：可以独立开发MVC三层架构网站：原始手段</p>
<p>ssm：简化了开发流程，配置十分复杂</p>
<blockquote>
<p>war包=&gt;tomcat运行</p>
</blockquote>
<p>Spring再简化：SpringBoot，微服务架构</p>
<blockquote>
<p>jar包：内嵌tomcat</p>
</blockquote>
<p>由于服务越来越多：Springcloud整理服务</p>
<p>配置：yaml</p>
<p>简化开发的原理：==自动装配、开箱即用==：面试核心</p>
<p>集成web开发：业务核心</p>
<p>集成数据库：druid数据源</p>
<p>分布式开发：Dubbo（RPC）+zookeeper【微服务方案1】</p>
<p>swagger：接口文档</p>
<p>任务调度</p>
<p>SpringSecurity：Shiro【AOP思想】</p>
<p>SpringCloud【微服务方案2】</p>
<p>Restful风格</p>
<p>Eureka</p>
<p>负载均衡：Nginx【ribbon、feign】</p>
<p>Hystrix：服务容灾</p>
<p>路由网关：Zuul</p>
<p>SpringCloud config+git通过git改变项目结构</p>
<h3 id="1、SpringBoot简介"><a href="#1、SpringBoot简介" class="headerlink" title="1、SpringBoot简介"></a>1、SpringBoot简介</h3><p>Spring：最小非侵入式编程：集成了Spring，只会在原有代码基础上扩展，而不会修改</p>
<p>Spring的简化点：</p>
<ul>
<li>Bean类</li>
<li>IOC</li>
<li>AOP</li>
<li>通过切面和模板减少样式代码</li>
</ul>
<p>为什么淘汰：停滞不前！</p>
<blockquote>
<p>发展思想：约定大于配置</p>
<p>从一个复杂的应用场景，衍生出框架，框架本质就是把一部分相同的工作给你做了，你只需要通过配置添加新功能，当配置变得复杂， 就用<code>约定&gt;配置</code>来简化。因为相同的东西越多，你需要做的就越少，这就是简化的核心</p>
</blockquote>
<p>maven：约定&gt;配置</p>
<p>spring、mvc：约定&gt;配置</p>
<p>springboot：约定&gt;配置</p>
<p>程序员：数据结构 + 算法</p>
<p>码农：面型对象 + 框架</p>
<h3 id="2、微服务架构"><a href="#2、微服务架构" class="headerlink" title="2、微服务架构"></a>2、微服务架构</h3><p>直观理解：原先是MVC三层架构，所有业务放在一起，例如Service层包含了UserService、BookService等等，而现在流行的微服务架构意思就是，单独把一个业务抽出去【原因是现在可能某些业务变得复杂，一台服务器已经放不下所有的业务了，此时，不同的业务单元分布在不同的主机上，这就是微服务架构，不同服务之间通过http、rpc等来进行信息交换】，这样，就可以将不同的业务分布在不同的主机上</p>
<p><img src="/2021/12/21/SpringBoot%E6%95%99%E7%A8%8B/kuangstudy3c0c69fd-0c43-46df-99d5-dda9b71ff920.png" alt="img"></p>
<p>图中一个小色片代表一个功能【或者说一项业务】</p>
<p>原先的MVC模式是所有业务集中在一起，然后将业务部署在许多主机上，通过负载均衡来分配主机，当某个主机的任务非常繁重时，就将新来的请求放在任务较轻的主机上</p>
<p>而微服务架构不同，微服务架构中功能模块，即业务是最小的单元，某些业务可能会占用较多的主机资源，而另一些业务则占用较少的主机资源，通过合理分配，可以使得主机的资源利用效率达到最高</p>
<p>好处：</p>
<ul>
<li><p>最优化主机资源分配</p>
</li>
<li><p>==每个功能元素都是一个可替换的，可独立升级的软件代码==：高内聚、低耦合【原先的模式，由于所有功能聚集在一起，最小的单元就是整个项目，升级一项功能，将导致整个主机暂停使用，而现在，最小的单元变成了一个功能，那么这样就可以单独升级某个功能】</p>
</li>
</ul>
<h3 id="3、第一个SpringBoot应用程序"><a href="#3、第一个SpringBoot应用程序" class="headerlink" title="3、第一个SpringBoot应用程序"></a>3、第一个SpringBoot应用程序</h3><p>方式：</p>
<ul>
<li><p>在官网下载<a target="_blank" rel="noopener" href="https://start.spring.io/">Spring Initializr</a>之后，导入idea</p>
</li>
<li><p>直接使用idea创建一个springboot【本质是从官网上导下来】</p>
</li>
</ul>
<p>从如下方面考虑自动装配</p>
<ul>
<li>你创建的springboot项目配置dispatcher servlet了吗</li>
<li>你写完代码，让你弄tomcat了吗</li>
<li>让你自己去扫描包了吗</li>
<li>……</li>
</ul>
<p>那么为什么你不用做这些事了呢</p>
<ul>
<li>springboot默认帮你做了呗<ul>
<li>你要spring帮你配置dispatcherservlet，请你导入web支持</li>
<li>你要spring帮你扫描包，请你按照springboot的要求，将包层级建立在application同一目录下</li>
<li>……</li>
</ul>
</li>
<li>这就是所谓的约定大于配置思想的进一步体现</li>
</ul>
<p>pom里面</p>
<p>groupid、artifactid、version合称GAV：代表了组件的坐标</p>
<p>pom里面：spring-boot-starter-web就是帮你配置web依赖的部分，tomcat、dispatcherservlet等等都是这个搞得</p>
<p>单元测试、打包插件</p>
<p>==所有的springboot依赖都是使用spring-boot-starter开头的==</p>
<h3 id="4、原理初探"><a href="#4、原理初探" class="headerlink" title="4、原理初探"></a>4、原理初探</h3><p><code>spring-boot-dependencies</code>父项的父项，管理了大量的jar包版本，同时配置了资源过滤的问题</p>
<p>我们在写或者引入一些Springboot依赖的时候，不需要指定版本，是因为父父项已经管理了大量的版本</p>
<h4 id="启动器："><a href="#启动器：" class="headerlink" title="启动器："></a>启动器：</h4><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--启动器--&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework.boot<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-boot-starter<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>



<ul>
<li><p>作用：指明了Springboot的启动场景，自动帮你装配各种依赖的东西</p>
<p>  例如：spring-boot-starter-web，<code>声明web启动器，则spring自动帮你导入各种依赖</code></p>
</li>
<li><p>springboot会将所有的功能场景，都封装成一个个启动器</p>
</li>
<li><p>要使用哪个功能，就声明对应的启动器就好了</p>
</li>
</ul>
<p>这一堆就是它的启动器【局部】</p>
<img src="/2021/12/21/SpringBoot%E6%95%99%E7%A8%8B/image-20211221175219650.png" alt="image-20211221175219650" style="zoom:50%;">



<h4 id="主程序"><a href="#主程序" class="headerlink" title="主程序"></a>主程序</h4><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 标注这个类是一个springboot应用</span></span><br><span class="line"><span class="meta">@SpringBootApplication</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Springboot01HellobootApplication</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        <span class="comment">// 将springboot应用启动</span></span><br><span class="line">        SpringApplication.run(Springboot01HellobootApplication.class, args);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<p>注解【过于复杂*】</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@SpringBootConfiguration</span></span><br><span class="line"><span class="meta">@EnableAutoConfiguration</span></span><br></pre></td></tr></table></figure>



<h4 id="SpringApplication"><a href="#SpringApplication" class="headerlink" title="SpringApplication"></a>SpringApplication</h4><p><strong>这个类主要做了以下四件事情：</strong></p>
<p>1、推断应用的类型是普通的项目还是Web项目【web项目持续，普通项目运行完就结束了】</p>
<p>2、查找并加载所有可用初始化器 ， 设置到initializers属性中</p>
<p>3、找出所有的应用程序监听器，设置到listeners属性中</p>
<p>4、推断并设置main方法的定义类，找到运行的主类</p>
<p>SpringBoot：核心就两点</p>
<ul>
<li>自动装配</li>
<li>run方法</li>
</ul>
<h3 id="5、yaml配置"><a href="#5、yaml配置" class="headerlink" title="5、yaml配置"></a>5、yaml配置</h3><figure class="highlight markdown"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="section"># spring这个配置文件中可以配置哪些东西</span></span><br><span class="line"></span><br><span class="line"><span class="section"># 官方的配置太多了……</span></span><br><span class="line"></span><br><span class="line"><span class="section"># 了解原理</span></span><br></pre></td></tr></table></figure>



<p>yaml</p>
<figure class="highlight yaml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># properties配置 key = value的形式</span></span><br><span class="line"><span class="comment"># yaml中 key: value key冒号后面的空格必须有！空格可以不止一个，但必须有</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># 对空格的要求十分高</span></span><br><span class="line"><span class="comment"># 可以注入到配置类中</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># 普通的key value</span></span><br><span class="line"><span class="comment">#</span></span><br><span class="line"><span class="attr">name:</span> <span class="string">mars</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># 对象</span></span><br><span class="line"><span class="comment">#</span></span><br><span class="line"><span class="attr">student:</span></span><br><span class="line">  <span class="attr">name:</span> <span class="string">mars</span></span><br><span class="line">  <span class="attr">age:</span> <span class="number">21</span></span><br><span class="line">  </span><br><span class="line">  </span><br><span class="line"><span class="comment"># properties的写法————properties只能存储实体类</span></span><br><span class="line"><span class="comment"># student.name = mars</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># 行内写法</span></span><br><span class="line"><span class="attr">students:</span> &#123;<span class="attr">name:</span> <span class="string">mars</span>, <span class="attr">age:</span> <span class="number">3</span>&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment"># 数组</span></span><br><span class="line"><span class="attr">pet:</span></span><br><span class="line">  <span class="bullet">-</span> <span class="string">cat</span></span><br><span class="line">  <span class="bullet">-</span> <span class="string">dog</span></span><br><span class="line">  <span class="bullet">-</span> <span class="string">pig</span></span><br><span class="line"></span><br><span class="line"><span class="attr">pets:</span> [<span class="string">cat</span>,<span class="string">dog</span>,<span class="string">pig</span>]</span><br></pre></td></tr></table></figure>

<p>@autowired</p>
<p>@qualifier</p>
<p>spring的el表达式</p>
<figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">person:</span></span><br><span class="line">  <span class="attr">name:</span> <span class="string">mars</span></span><br><span class="line">  <span class="attr">age:</span> <span class="string">$&#123;random.int&#125;</span></span><br><span class="line">  <span class="attr">happy:</span> <span class="literal">true</span></span><br><span class="line">  <span class="attr">birth:</span> <span class="number">2019</span><span class="string">/02/01</span></span><br><span class="line">  <span class="attr">maps:</span> &#123;<span class="attr">k1:</span> <span class="string">v1</span>,<span class="attr">k2:</span> <span class="string">v2</span>&#125;</span><br><span class="line"><span class="comment">#  hello: 如果有我，狗名为这条语句，没我狗名为旺财</span></span><br><span class="line">  <span class="attr">lists:</span></span><br><span class="line">    <span class="bullet">-</span> <span class="string">code</span></span><br><span class="line">    <span class="bullet">-</span> <span class="string">music</span></span><br><span class="line">    <span class="bullet">-</span> <span class="string">girl</span></span><br><span class="line">  <span class="attr">dog:</span></span><br><span class="line">    <span class="attr">name:</span> <span class="string">$&#123;person.hello:hello&#125;_旺财</span></span><br><span class="line">    <span class="attr">age:</span> <span class="number">3</span></span><br></pre></td></tr></table></figure>





<p>最佳实践：</p>
<ul>
<li>配置yml和配置properties都可以获取到值，强烈推荐yml</li>
<li>如果我们在某个业务中，只需要获取配置文件中的<code>某个值</code>，可以使用@value</li>
<li>如果专门编写了一个javaBean来和配置文件进行映射，就直接使用@configurationProperties</li>
</ul>
<table>
<thead>
<tr>
<th>属性</th>
<th>yml</th>
<th>properties</th>
</tr>
</thead>
<tbody><tr>
<td>松散绑定</td>
<td>√</td>
<td>×</td>
</tr>
<tr>
<td>JSR303数据校验</td>
<td>√</td>
<td>×</td>
</tr>
<tr>
<td>SpEL</td>
<td>×</td>
<td>√</td>
</tr>
<tr>
<td>复杂类型封装</td>
<td>√</td>
<td>×</td>
</tr>
</tbody></table>
<p>松散绑定：bean的驼峰对应yml的中划线</p>
<p>JSR303：@Validated注解</p>
<p>需要添加依赖：</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework.boot<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-boot-starter-validation<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>





<h4 id="多环境配置"><a href="#多环境配置" class="headerlink" title="多环境配置"></a>多环境配置</h4><p>相同的属性会被覆盖，不同的会保留</p>
<p>1、多个配置文件的优先级</p>
<img src="/2021/12/21/SpringBoot%E6%95%99%E7%A8%8B/image-20211222092922715.png" alt="image-20211222092922715" style="zoom: 50%;">

<p>2、别名激活</p>
<img src="/2021/12/21/SpringBoot%E6%95%99%E7%A8%8B/image-20211222101141345.png" alt="image-20211222101141345" style="zoom: 67%;">

<figure class="highlight yaml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">spring:</span></span><br><span class="line">  <span class="attr">profiles:</span></span><br><span class="line">    <span class="attr">active:</span> <span class="string">dev</span></span><br></pre></td></tr></table></figure>



<p>3、合并到一个文档的写法</p>
<figure class="highlight yaml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">spring:</span></span><br><span class="line">  <span class="attr">profiles:</span></span><br><span class="line">    <span class="attr">active:</span> <span class="string">dev</span></span><br><span class="line"></span><br><span class="line"><span class="attr">server:</span></span><br><span class="line">  <span class="attr">port:</span> <span class="number">8080</span></span><br><span class="line">  </span><br><span class="line"><span class="meta">---</span></span><br><span class="line"><span class="attr">server:</span></span><br><span class="line">  <span class="attr">port:</span> <span class="number">8081</span></span><br><span class="line"><span class="attr">spring:</span></span><br><span class="line">  <span class="attr">config:</span></span><br><span class="line">    <span class="attr">activate:</span></span><br><span class="line">      <span class="attr">on-profile:</span> <span class="string">test</span></span><br><span class="line">      </span><br><span class="line"><span class="meta">---</span></span><br><span class="line"><span class="attr">server:</span></span><br><span class="line">  <span class="attr">port:</span> <span class="number">8082</span></span><br><span class="line"><span class="attr">spring:</span></span><br><span class="line">  <span class="attr">config:</span></span><br><span class="line">    <span class="attr">activate:</span></span><br><span class="line">      <span class="attr">on-profile:</span> <span class="string">dev</span></span><br></pre></td></tr></table></figure>

<blockquote>
<p>自动装配要补原理啊！</p>
</blockquote>
<h3 id="6、SpringBoot-WEB开发"><a href="#6、SpringBoot-WEB开发" class="headerlink" title="6、SpringBoot WEB开发"></a>6、SpringBoot WEB开发</h3><h4 id="静态资源"><a href="#静态资源" class="headerlink" title="静态资源"></a>静态资源</h4><p>在springboot中，我们可以使用以下方式处理web静态资源</p>
<ul>
<li>webjars   =&gt; localhost:8080/webjars/</li>
<li>public  =&gt; localhost:8080/</li>
<li>static</li>
<li>resources</li>
</ul>
<p>优先级：resources &gt; static &gt; public</p>
<p>可以通过这种方式配置，配置后原来的文件夹会失效</p>
<figure class="highlight properties"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">spring.mvc.static-path-pattern</span> = <span class="string">/hello, classpath:/mars/</span></span><br></pre></td></tr></table></figure>



<p>classpath：resources和java目录</p>
<p>file：springboot根目录</p>
<h3 id="模板引擎-Thymeleaf"><a href="#模板引擎-Thymeleaf" class="headerlink" title="模板引擎-Thymeleaf"></a>模板引擎-Thymeleaf</h3><p>要使用thymeleaf，只要导入对应的依赖！我们在html放在templates目录下即可</p>
<figure class="highlight markdown"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="section"># SpringBoot在配置组件的时候, 会先看有没有用户自己配置的,如果有用户自己配置的,就用用户配置的</span></span><br><span class="line"><span class="section"># 如果有些组件可以存在多个,比如视图解析器,就将用户配置的和自己默认的组合起来</span></span><br></pre></td></tr></table></figure>



<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 如果想要自定义diy一些定制化的功能，只需要写这个组件，然后@Bean交给springboot，springboot就会自动装配</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 扩展Spring MVC</span></span><br><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MvcConfig</span> <span class="keyword">implements</span> <span class="title">WebMvcConfigurer</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 实现了视图解析器接口的类，就可以看作视图解析器 public interface ViewResolver</span></span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> ViewResolver <span class="title">myViewResolver</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> MyViewResolver();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 自定义了一个视图解析器</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">MyViewResolver</span> <span class="keyword">implements</span> <span class="title">ViewResolver</span></span>&#123;</span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> View <span class="title">resolveViewName</span><span class="params">(String viewName, Locale locale)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">            <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>





<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 如果我们要扩展SpringMVC,官方建议我们这样去做</span></span><br><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="comment">//@EnableWebMvc // 这玩意实际上导入了一个类: DelegatingWebMvcConfiguration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MvcConfig</span> <span class="keyword">implements</span> <span class="title">WebMvcConfigurer</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 视图跳转</span></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">addViewControllers</span><span class="params">(ViewControllerRegistry registry)</span> </span>&#123;</span><br><span class="line">        registry.addViewController(<span class="string">&quot;/mars&quot;</span>).setViewName(<span class="string">&quot;test&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 在templates目录下的所有页面，只能通过controller来跳转，就像原来的web-inf</span></span><br><span class="line"><span class="meta">@Controller</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">IndexController</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@RequestMapping(&quot;/test&quot;)</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">index</span><span class="params">(Model model)</span></span>&#123;</span><br><span class="line">        model.addAttribute(<span class="string">&quot;msg&quot;</span>,<span class="string">&quot;&lt;h1&gt;hello,springboot!&lt;/h1&gt;&quot;</span>);</span><br><span class="line">        model.addAttribute(<span class="string">&quot;users&quot;</span>, Arrays.asList(<span class="string">&quot;qinjiang&quot;</span>,<span class="string">&quot;kuangshen&quot;</span>));</span><br><span class="line">        <span class="keyword">return</span> <span class="string">&quot;test&quot;</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--所有的html元素，都可以被thymeleaf接管--&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">h1</span> <span class="attr">th:text</span>=<span class="string">&quot;$&#123;msg&#125;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">th:utext</span>=<span class="string">&quot;$&#123;msg&#125;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">hr</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">th:each</span>=<span class="string">&quot;user:$&#123;users&#125;&quot;</span> <span class="attr">th:text</span>=<span class="string">&quot;$&#123;user&#125;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">th:each</span>=<span class="string">&quot;user:$&#123;users&#125;&quot;</span>&gt;</span>[[$&#123;user&#125;]]<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br></pre></td></tr></table></figure>



<h3 id="7、Demo"><a href="#7、Demo" class="headerlink" title="7、Demo"></a>7、Demo</h3><p>spring自带默认配置，所以你就弄一个index.html，直接默认就是首页，但这样无法引入css，js等</p>
<p>可以直接写静态资源文件夹下的东西，即省略static这一层目录</p>
<p><code>@&#123;/&#125;</code>这里的 / 就是项目的根目录【是相对路径，项目的实际路径是会根据上下文变化而变化的】</p>
<p>1、首页配置：所有的静态资源<code>@&#123;/&#125;</code>，如果没有/，会拼接到请求路径后【如果从/user跳转，就拼接成/user/xxx】</p>
<p>2、页面国际化</p>
<ul>
<li>配置i18n文件</li>
<li>如果需要在项目中进行按钮切换，需要定义一个组件LocaleResolver</li>
<li>记得将自己写的组件配置到Spring容器</li>
<li>#{}</li>
</ul>
<h2 id="SpringBoot重构"><a href="#SpringBoot重构" class="headerlink" title="SpringBoot重构"></a>SpringBoot重构</h2><h3 id="0、复习Spring"><a href="#0、复习Spring" class="headerlink" title="0、复习Spring"></a>0、复习Spring</h3><h4 id="0-1-Bean的自动装配"><a href="#0-1-Bean的自动装配" class="headerlink" title="0.1 Bean的自动装配"></a>0.1 Bean的自动装配</h4><p>bean类不应当写构造函数？set注入，是通过set方法注入的</p>
<p>实体类</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Data</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">People</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> Cat cat;</span><br><span class="line">    <span class="keyword">private</span> Dog dog;</span><br><span class="line">    <span class="keyword">private</span> String name;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>配置文件</p>
<ul>
<li>公共部分</li>
</ul>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;dog&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.Dog&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;cat&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.Cat&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<p><strong>A：原先的装配</strong></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;people&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.People&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;cat&quot;</span> <span class="attr">ref</span>=<span class="string">&quot;cat&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;dog&quot;</span> <span class="attr">ref</span>=<span class="string">&quot;dog&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;name&quot;</span> <span class="attr">value</span>=<span class="string">&quot;mars&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>B：<strong>自动装配——autowire属性</strong></p>
<p>ByName</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;people&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.People&quot;</span> <span class="attr">autowire</span>=<span class="string">&quot;byName&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;name&quot;</span> <span class="attr">value</span>=<span class="string">&quot;mars&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br></pre></td></tr></table></figure>

<blockquote>
<p>自动寻找上下文中，与set针对的属性名相同的beanid，并完成注入</p>
<p>这里由于实体类使用了Lombok，cat对应的自然是setCat，所以会把公共部分中的cat注入到people中</p>
</blockquote>
<ul>
<li>缺点：名字必须相同</li>
</ul>
<p>ByType</p>
<blockquote>
<p>自动寻找上下文中，与bean本身字段相同类的bean</p>
</blockquote>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;dog1&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.Dog&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;cat1&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.Cat&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;people&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.People&quot;</span> <span class="attr">autowire</span>=<span class="string">&quot;byType&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;name&quot;</span> <span class="attr">value</span>=<span class="string">&quot;mars&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>这里由于people的两个字段，本别是Cat类和Dog类，所以就找相同类型的，而忽略名字【id可以省略】</p>
<ul>
<li>缺点：类型必须唯一</li>
</ul>
<h4 id="0-2-注解实现自动装配"><a href="#0-2-注解实现自动装配" class="headerlink" title="0.2 注解实现自动装配"></a>0.2 注解实现自动装配</h4><blockquote>
<p>要使用注解，需要导入注解支持、</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">context:annotation-config</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<p>导入这个的原因是：要使用注解，也需要注册注解的bean，例如使用AutoWired注解，就要这样：</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">class</span>=<span class="string">&quot;org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor &quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<p>而使用了上述配置后，spring会自动帮我们隐式声明注解的bean，你就不用定义注解的bean了</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">context:component-scan</span> <span class="attr">base-package</span>=<span class="string">&quot;pack.pack&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<p>而使用了上述代码后，除了扫描包，同时也会把第一条语句的作用给干了</p>
</blockquote>
<p>@Autowired：</p>
<p>直接在属性上使用！也可以在set方法上使用</p>
<p>本质是用过反射实现的，所以可以不需要set方法</p>
<p>作用原理：</p>
<ul>
<li>是通过ByType寻找的</li>
</ul>
<p>@Qualifier是通过名字查找的</p>
<p>@Qualifier是不能单独存在的，必须配合@Autowired</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Autowired</span></span><br><span class="line"><span class="keyword">private</span> Cat cat;</span><br><span class="line"><span class="meta">@Autowired</span></span><br><span class="line"><span class="meta">@Qualifier(value = &quot;dog2&quot;)</span></span><br><span class="line"><span class="keyword">private</span> Dog dog;</span><br></pre></td></tr></table></figure>

<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">context:annotation-config</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;dog1&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.Dog&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;dog2&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.Dog&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;cat1&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.Cat&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;people&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.People&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<p>两者组合就是@Resource</p>
<p>只要名字和类型满足一个即可【默认通过byname，找不到名字，就用bytype】</p>
<ul>
<li>名字：和字段名字相同</li>
<li>类型：只能有一个</li>
</ul>
<p>以下的例子是采用了名字</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Resource</span></span><br><span class="line"><span class="keyword">private</span> Cat cat;</span><br></pre></td></tr></table></figure>

<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;cat&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.Cat&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;cat1&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.Cat&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<p>这样则是采用了类型：</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;cat1&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.Cat&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<p>如果像如下这样，则会报空指针，因为两者都不满足</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;cat2&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.Cat&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;cat1&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.Cat&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>



<p>此时，可以给Resource注解指定名字</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Resource(name = &quot;cat1&quot;)</span></span><br><span class="line"><span class="keyword">private</span> Cat cat;</span><br></pre></td></tr></table></figure>



<blockquote>
<p>通常在项目中，对象都是单例的，则用Autowired即可</p>
</blockquote>
<p>@Nullable：可以为空</p>
<p>@Autowired(require = false)：说明该对象可以为null，否则为空</p>
<h4 id="0-3-注解开发"><a href="#0-3-注解开发" class="headerlink" title="0.3 注解开发"></a>0.3 注解开发</h4><p>1、Bean的注解</p>
<p>2、属性注入</p>
<p>3、衍生的注解</p>
<p>4、自动装配</p>
<p>5、作用域</p>
<p>6、小结</p>
<p>注意：</p>
<ul>
<li>必须保证依赖中有aop包【web-mvc中自带了这个包】</li>
<li>必须保证context约束导入</li>
</ul>
<p>在applicationContext中导入如下：</p>
<p>注解驱动</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">context:annotation-config</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<p>指定注解生效的包</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">context:component-scan</span> <span class="attr">base-package</span>=<span class="string">&quot;com.mars&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<p>@Component注解——注册bean</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">User</span> </span>&#123;</span><br><span class="line">    <span class="keyword">public</span> String name = <span class="string">&quot;qinjiang&quot;</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>@Value</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Value(&quot;mars&quot;)</span></span><br><span class="line"><span class="keyword">public</span> String name;</span><br></pre></td></tr></table></figure>

<p>也可以放在setter上</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Value(&quot;mars&quot;)</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">this</span>.name = name;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<blockquote>
<p>衍生注解：</p>
<p>@Component</p>
<ul>
<li>Dao层——@Repository</li>
<li>Service层——@Service</li>
<li>Controller层——@Controller</li>
</ul>
<p>这四个注解功能是完全一样的，都是代表将某个类注册到Spring中，装配bean </p>
</blockquote>
<p>@Scope：作用域</p>
<ul>
<li><p>singleton：单例模式</p>
</li>
<li><p>prototype：原型模式</p>
</li>
</ul>
<p>xml更加万能，适用于任何场合，维护方便</p>
<p>注解：维护相对复杂</p>
<p>要让注解生效</p>
<ul>
<li>注解驱动</li>
<li>哪些注解可以用【扫描包】</li>
</ul>
<h4 id="配置类：使用java的方式配置Spring【在springboot中大量使用】"><a href="#配置类：使用java的方式配置Spring【在springboot中大量使用】" class="headerlink" title="配置类：使用java的方式配置Spring【在springboot中大量使用】"></a>配置类：使用java的方式配置Spring【在springboot中大量使用】</h4><p>完全摒弃配置文件，全权交给java来做</p>
<p>User类【一个干干净净的实体类】</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">User</span> </span>&#123;</span><br><span class="line">    <span class="keyword">public</span> String name;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.name = name;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>配置类</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">AppConfig</span> </span>&#123;</span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> User <span class="title">user1</span><span class="params">()</span></span>&#123;</span><br><span class="line">        User u = <span class="keyword">new</span> User();</span><br><span class="line">        u.name = <span class="string">&quot;mars&quot;</span>;</span><br><span class="line">        <span class="keyword">return</span> u;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>配置类相比于配置文件，显得极为灵活，因为本质是在操作java</p>
<ul>
<li><p>@Configuration表示这是一个注解类，点进去看后，会发现里面同样有@Component，因为不被Spring托管你怎么起作用呢</p>
</li>
<li><p>@Bean表示返回一个实体bean，返回的就是注入到Spring中的</p>
<ul>
<li>@Bean和@Component家族作用是相同的，都是将一个类注册到spring容器中，只不过@Bean通常用在配置类中，而后者用在实际java类中</li>
<li>前者用在方法上，后者用在类上</li>
</ul>
</li>
<li><p>@Bean作用的方法：方法名就是注入到Spring中的对象名，类型就是注入进去的对象类型</p>
</li>
<li><p>使用了配置类，无需再配置注解驱动和扫描包</p>
<ul>
<li><p>如果项扫描包：</p>
</li>
<li><p>```java<br>  @ComponentScan({})</p>
  <figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">==注意：一旦在bean上加@Repository，Bean就自动被注册了，如果想通过条件限制bean的创建，就不要在Bean类上直接加@Repository==</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">`通过AnnotationConfigApplicationContext来获取`</span><br><span class="line"></span><br><span class="line">```java</span><br><span class="line">ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);</span><br></pre></td></tr></table></figure></li>
</ul>
</li>
</ul>
<p>之前配置文件xml可以多xml组合，现在多个配置类也可以，通过@Import标签</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Import(Config.class)</span></span><br></pre></td></tr></table></figure>



<h3 id="总结Spring注入到容器中的几种方式"><a href="#总结Spring注入到容器中的几种方式" class="headerlink" title="总结Spring注入到容器中的几种方式"></a>总结Spring注入到容器中的几种方式</h3><p>配置文件本质上和配置类是一个东西</p>
<p>配置文件-单独声明 配置类-单独声明</p>
<p>配置类扫描包 配置文件扫描包</p>
<p>除了配置文件单独声明，都需要@Component注解配合</p>
<ul>
<li><p>A：通过配置文件 </p>
  <figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;cat&quot;</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.bean.Cat&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure></li>
</ul>
<ul>
<li><p>B：通过@Component系列+配置文件中两条规则</p>
<p>  实体类：</p>
  <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Repository</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">User</span> </span>&#123;&#125;</span><br></pre></td></tr></table></figure>

<p>  配置文件：</p>
  <figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">context:annotation-config</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">context:component-scan</span> <span class="attr">base-package</span>=<span class="string">&quot;com.mars&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<p>  其实这里已经很清楚了，第一条规则帮助我们隐式将注解注入容器【你要使用注解，当然要注入到容器】，<strong>第二条规则就是扫描包，和下面的D方式完全一致！</strong></p>
</li>
<li><p>C1：通过@Component系列+配置类中Bean单独声明</p>
<p>  实体类：</p>
  <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Repository</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">User</span> </span>&#123;&#125;</span><br></pre></td></tr></table></figure>

<p>  配置类：</p>
  <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">AppConfig</span> </span>&#123;</span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> User <span class="title">user1</span><span class="params">()</span></span>&#123;</span><br><span class="line">        User u = <span class="keyword">new</span> User();</span><br><span class="line">        u.name = <span class="string">&quot;mars&quot;</span>;</span><br><span class="line">        <span class="keyword">return</span> u;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></li>
<li><p>C2：通过@Component系列+@ComponentScan扫描包</p>
<p>  实体类：</p>
  <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Repository</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">User</span> </span>&#123;&#125;</span><br></pre></td></tr></table></figure>

<p>  配置类：</p>
  <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="meta">@ComponentScan(value = &quot;com.mars.bean&quot;)</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">AppConfig</span> </span>&#123;&#125;</span><br></pre></td></tr></table></figure></li>
</ul>
<p>总结：</p>
<blockquote>
<p>==只有@Component系列是无法完成注册的：==</p>
<p>@Component就像是声明哪些人是特工，然后要么：</p>
<ul>
<li>一个一个抓走——在配置类中@Bean</li>
<li>一遍全部抓走——在配置类中@ComponentScan</li>
<li>不使用配置类，而是使用配置文件，然后component-scan</li>
</ul>
</blockquote>
<p>第0.1 小节阐述的是如何完成依赖注入到bean，而不是如何把bean注册到容器中</p>
<h2 id="SpringBoot！【补狂神的shiro和定时器】devtools"><a href="#SpringBoot！【补狂神的shiro和定时器】devtools" class="headerlink" title="SpringBoot！【补狂神的shiro和定时器】devtools"></a>SpringBoot！【补狂神的shiro和定时器】devtools</h2><p>Springboot最好的地方是针对微服务的，每一个服务就是一个Springboot应用</p>
<p>SpringCloud是基于SpringBoot构建的</p>
<h4 id="SpringBoot核心思想"><a href="#SpringBoot核心思想" class="headerlink" title="SpringBoot核心思想"></a>SpringBoot核心思想</h4><p>Spring的缺点：</p>
<ul>
<li>配置文件繁琐，要配置视图解析器、配置拦截器、配置注解等</li>
<li>依赖文件繁琐，且可能产生版本冲突</li>
</ul>
<p>SpringBoot的功能：</p>
<ul>
<li><p>==自动配置==：在项目启动时才决定配置应用哪个</p>
</li>
<li><p>==起步依赖==：本质是一个Maven对象模型Project Object Model=POM，定义了对其他库的传递依赖，这些东西加在一起提供某些功能【这是不是就是所谓的starter？开箱即用】</p>
<p>  原先，为了实现一个功能模块，需要导入A依赖，B依赖，C依赖，同时注意版本，而现在不需要了</p>
</li>
<li><p>辅助功能：</p>
<ul>
<li>嵌入式服务器：内置了Tomcat等服务器</li>
<li>安全、指标、健康检测、外部配置等</li>
</ul>
</li>
</ul>
<p><code>SpringBoot不是对Spring功能上的增强，而是提供了一种快速开发Spring项目的方式</code></p>
<h4 id="SpringBoot快速入门"><a href="#SpringBoot快速入门" class="headerlink" title="SpringBoot快速入门"></a>SpringBoot快速入门</h4><p>Maven坐标：GAV——group——Artifact——Version？</p>
<p>SpringBoot的POM特点：</p>
<ul>
<li><p>Parent父工程</p>
</li>
<li><p>导入一个spring-boot-starter-web即可</p>
</li>
</ul>
<blockquote>
<p>引导类——启动器</p>
</blockquote>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@SpringBootApplication</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">HelloApplication</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        SpringApplication.run(HelloApplication.class,args);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<blockquote>
<p>Controller——使用SpringBoot和Spring构建的项目，业务代码编写完全一致</p>
</blockquote>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@RestController</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">HelloController</span> </span>&#123;</span><br><span class="line">    <span class="meta">@RequestMapping(&quot;/hello&quot;)</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">hello</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">&quot;hello&quot;</span>;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h4 id="起步依赖原理分析："><a href="#起步依赖原理分析：" class="headerlink" title="起步依赖原理分析："></a>起步依赖原理分析：</h4><ul>
<li>A：spring-boot-starter-parent</li>
<li>B：spring-boot-starter-web</li>
</ul>
<p>A——parent——dependencies</p>
<ul>
<li><p>Properties：属性信息——记录了各种框架的版本——==所有starter中依赖的，都是这里定义好的==</p>
</li>
<li><p>DependencyManagement：版本锁定——<code>父工程定义好一些版本信息，子工程就不需要版本了</code></p>
</li>
<li><blockquote>
<p>SpringBoot的每个发行版都组合了各主流框架的较新版本，并经过测试确保不会造成冲突</p>
</blockquote>
</li>
</ul>
<p>B——web</p>
<ul>
<li><p>web中组合了如下版本</p>
</li>
<li><p>```xml</p>
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
      <version>2.6.2</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-json</artifactId>
      <version>2.6.2</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-tomcat</artifactId>
      <version>2.6.2</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>5.3.14</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.3.14</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>
  <figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 所谓的==依赖传递==，就是在starter中组合好各个所需模块，每个starter就是一个功能模块。starter将完成这个功能模块所需的各种依赖传递进来，即依赖传递</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">#### 配置</span><br><span class="line"></span><br><span class="line">Spring是基于约定的，很多配置都有默认值，如果想使用自己的值替换默认值的话，就可以用配置文件了</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">小结：</span><br><span class="line"></span><br><span class="line">SpringBoot提供了两种配置文件的类型，Properties和yml</span><br><span class="line"></span><br><span class="line">默认配置文件名称【application】——现在还不能改</span><br><span class="line"></span><br><span class="line">- 同一级目录下：properties &gt; yml &gt; yaml【加载顺序反过来，最后加载的保留作用】</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">- yml中的缩进没有具体多少格，同一缩进的层级相同，冒号后的空格数目也无所谓，有就行</span><br><span class="line"></span><br><span class="line">- 不允许使用tab，要使用空格</span><br><span class="line">- #表示忽略</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">yml的数据格式：</span><br><span class="line"></span><br><span class="line">==键：值==</span><br><span class="line"></span><br><span class="line">&gt; A：对象</span><br><span class="line">&gt;</span><br><span class="line">&gt; ~~~yml</span><br><span class="line">&gt; person:</span><br><span class="line">&gt;   name: zhangsan</span><br><span class="line">&gt; # 行内写法  </span><br><span class="line">&gt; person: &#123;name: zhangsan&#125;  </span><br><span class="line">&gt; ~~~</span><br><span class="line">&gt;</span><br><span class="line">&gt; 直接获取person是获取不到的，可以获取到person.name</span><br><span class="line">&gt;</span><br><span class="line">&gt; B：数组——注意横杠后面的空格</span><br><span class="line">&gt;</span><br><span class="line">&gt; ~~~yml</span><br><span class="line">&gt; address:</span><br><span class="line">&gt;   - beijing </span><br><span class="line">&gt;   - shanghai</span><br><span class="line">&gt; # 行内写法  </span><br><span class="line">&gt; address: [beijing, shanghai]  </span><br><span class="line">&gt; ~~~</span><br><span class="line">&gt;</span><br><span class="line">&gt; C：纯量</span><br><span class="line">&gt;</span><br><span class="line">&gt; ~~~yml</span><br><span class="line">&gt; msg1: &#x27;hello \n world&#x27; #单引号忽略转义字符</span><br><span class="line">&gt; msg2: &quot;hello \n world&quot; #双引号识别转义字符</span><br><span class="line">&gt; ~~~</span><br><span class="line">&gt;</span><br><span class="line">&gt; D：引用</span><br><span class="line">&gt;</span><br><span class="line">&gt; ~~~yml</span><br><span class="line">&gt; name: zhangsan</span><br><span class="line">&gt; person:</span><br><span class="line">&gt;   name: $&#123;name&#125;</span><br><span class="line">&gt; ~~~</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">yml有两种作用：</span><br><span class="line"></span><br><span class="line">- spring组件自动读取</span><br><span class="line">- 自定义使用——可以通过@ConfigurationProperties注解来使用</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">#### 读取</span><br><span class="line"></span><br><span class="line">1、@Value——需要在字段上使用</span><br><span class="line"></span><br><span class="line">```java</span><br><span class="line">@Value(&quot;$&#123;person.name&#125;&quot;)</span><br><span class="line">private String name;</span><br><span class="line"></span><br><span class="line">@Value(&quot;$&#123;address[0]&#125;&quot;)</span><br><span class="line">private String address;</span><br><span class="line"></span><br><span class="line">@Value(&quot;$&#123;msg1&#125;&quot;)</span><br><span class="line">private String msg1;</span><br><span class="line"></span><br><span class="line">public void print()&#123;</span><br><span class="line">    System.out.println(name);</span><br><span class="line">    System.out.println(address);</span><br><span class="line">    System.out.println(msg1);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></li>
</ul>
<p>2、Environment——不需要指明字段</p>
<blockquote>
<p>env.getProperty(“key”)</p>
</blockquote>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Autowired</span></span><br><span class="line"><span class="keyword">private</span> Environment env;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">print</span><span class="params">()</span></span>&#123;</span><br><span class="line">    System.out.println(env.getPropert4y(<span class="string">&quot;name&quot;</span>) + env.getProperty(<span class="string">&quot;person&quot;</span>) + env.getProperty(<span class="string">&quot;person.name&quot;</span>));</span><br><span class="line">    System.out.println(env.getProperty(<span class="string">&quot;address[0]&quot;</span>) + env.getProperty(<span class="string">&quot;address[1]&quot;</span>));</span><br><span class="line">    System.out.println(env.getProperty(<span class="string">&quot;msg1&quot;</span>) + <span class="string">&#x27;\n&#x27;</span> + env.getProperty(<span class="string">&quot;msg2&quot;</span>));</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>3、ConfigurationProperties：现在必须带上前缀</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Repository</span></span><br><span class="line"><span class="meta">@ConfigurationProperties(prefix = &quot;person&quot;)</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Person</span> </span>&#123;</span><br></pre></td></tr></table></figure>

<figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">person:</span></span><br><span class="line">  <span class="attr">name:</span> <span class="string">def</span></span><br><span class="line">  <span class="attr">age:</span> <span class="number">12</span></span><br><span class="line">  <span class="attr">address:</span></span><br><span class="line">    <span class="bullet">-</span> <span class="string">beijing</span></span><br><span class="line">    <span class="bullet">-</span> <span class="string">nanjing</span></span><br></pre></td></tr></table></figure>

<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Autowired</span></span><br><span class="line">Person person;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">print</span><span class="params">()</span></span>&#123;</span><br><span class="line">    System.out.println(person.toString());</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<h4 id="Profiles配置"><a href="#Profiles配置" class="headerlink" title="Profiles配置"></a>Profiles配置</h4><p>在实际的开发中，会有多套配置，此时可以通过profiles来切换</p>
<p>方案一：</p>
<img src="/2021/12/21/SpringBoot%E6%95%99%E7%A8%8B/image-20211224205056814.png" alt="image-20211224205056814" style="zoom: 67%;">

<figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">spring:</span></span><br><span class="line">  <span class="attr">profiles:</span></span><br><span class="line">    <span class="attr">active:</span> <span class="string">dev</span></span><br></pre></td></tr></table></figure>

<p>方案二：</p>
<figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">---</span></span><br><span class="line"><span class="attr">server:</span></span><br><span class="line">  <span class="attr">port:</span> <span class="number">8081</span></span><br><span class="line"><span class="attr">spring:</span></span><br><span class="line">  <span class="attr">config:</span></span><br><span class="line">    <span class="attr">activate:</span></span><br><span class="line">      <span class="attr">on-profile:</span> <span class="string">dev</span></span><br><span class="line"><span class="meta">---</span></span><br><span class="line"><span class="meta"></span></span><br><span class="line"><span class="attr">spring:</span></span><br><span class="line">  <span class="attr">config:</span></span><br><span class="line">    <span class="attr">activate:</span></span><br><span class="line">      <span class="attr">on-profile:</span> <span class="string">test</span></span><br><span class="line"><span class="attr">server:</span></span><br><span class="line">  <span class="attr">port:</span> <span class="number">8082</span></span><br><span class="line"><span class="meta">---</span></span><br><span class="line"><span class="attr">spring:</span></span><br><span class="line">  <span class="attr">config:</span></span><br><span class="line">    <span class="attr">activate:</span></span><br><span class="line">      <span class="attr">on-profile:</span> <span class="string">pro</span></span><br><span class="line"><span class="attr">server:</span></span><br><span class="line">  <span class="attr">port:</span> <span class="number">8083</span></span><br><span class="line"><span class="meta">---</span></span><br><span class="line"><span class="attr">spring:</span></span><br><span class="line">  <span class="attr">profiles:</span></span><br><span class="line">    <span class="attr">active:</span> <span class="string">test</span></span><br></pre></td></tr></table></figure>



<blockquote>
<p>当然，除了在文件中配置，还可以通过虚拟机和命令行的方式</p>
<p>虚拟机参数：在VM options中指定</p>
<p>-Dspring.profiles.active=dev</p>
<p>命令行参数：</p>
<p>–spring.profiles.active=dev</p>
</blockquote>
<p>常见配置字段：</p>
<p>server.port 端口</p>
<p>server.servlet.context-path=/hello 项目的路径，默认是/</p>
<h4 id="内部文件配置顺序：见上"><a href="#内部文件配置顺序：见上" class="headerlink" title="内部文件配置顺序：见上"></a>内部文件配置顺序：见上</h4><h4 id="外部文件配置顺序："><a href="#外部文件配置顺序：" class="headerlink" title="外部文件配置顺序："></a>外部文件配置顺序：</h4><blockquote>
<p>注意：resources文件夹外面的配置文件不会被放在jar包中</p>
</blockquote>
<p>如果是简单修改的话，可以这样：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">java -jar xxx --server.port=8082</span><br></pre></td></tr></table></figure>

<p>如果复杂修改的话，可以建立外部配置文件</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">java -jar xxx --spring.config.location=e://application.properties</span><br></pre></td></tr></table></figure>

<p>可以把这个配置文件放在和jar包同级，则自动加载，也可以同级目录下建一个config文件夹，放里面，级别高于直接同级的</p>
<p>@Component</p>
<p>@autowired作用逻辑？</p>
<h4 id="springboot整合单元测试"><a href="#springboot整合单元测试" class="headerlink" title="springboot整合单元测试"></a>springboot整合单元测试</h4><p>单元测试步骤：</p>
<p>Junit单元测试的注解：</p>
<p>@BeforeClass：针对所有测试，只执行一次，且必须为static void</p>
<p>@Before：初始化方法，执行当前测试类的每个测试方法前执行。</p>
<p>@Test：测试方法，在这里可以测试期望异常和超时时间</p>
<p>@After：释放资源，执行当前测试类的每个测试方法后执行</p>
<p>@AfterClass：针对所有测试，只执行一次，且必须为static void</p>
<p>@Ignore：忽略的测试方法（只在测试类的时候生效，单独执行该测试方法无效）</p>
<p>@RunWith:可以更改测试运行器 ，缺省值【默认值】org.junit.runner.Runner</p>
<p>一个单元测试类执行顺序为：</p>
<p>@BeforeClass<code>–&gt;</code>@Before<code>–&gt;</code>@Test<code>–&gt;</code>@After<code>–&gt;</code>@AfterClass</p>
<p>每一个测试方法的调用顺序为：</p>
<p>@Before<code>–&gt;</code>@Test<code>–&gt;</code>@After</p>
<p>==核心注解一：@RunWith（SpringRunner.class）==</p>
<p>功能：允许开发人员使用不同的值反复测试同一个测试 </p>
<p>下面是一个Junit的demo</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//1.更改默认的测试运行器为RunWith(Parameterized.class)</span></span><br><span class="line"><span class="meta">@RunWith(Parameterized.class)</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ParameterTest</span> </span>&#123;</span><br><span class="line">    <span class="comment">// 2.声明变量存放预期值和测试数据</span></span><br><span class="line">    <span class="keyword">private</span> String firstName;</span><br><span class="line">    <span class="keyword">private</span> String lastName;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//3.声明一个返回值 为Collection的公共静态方法，并使用@Parameters进行修饰</span></span><br><span class="line">    <span class="meta">@Parameterized</span>.Parameters <span class="comment">//</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> List&lt;Object[]&gt; param() &#123;</span><br><span class="line">        <span class="comment">// 这里我给出两个测试用例</span></span><br><span class="line">        <span class="keyword">return</span> Arrays.asList(<span class="keyword">new</span> Object[][]&#123;&#123;<span class="string">&quot;Mike&quot;</span>, <span class="string">&quot;Black&quot;</span>&#125;, &#123;<span class="string">&quot;Cilcln&quot;</span>, <span class="string">&quot;Smith&quot;</span>&#125;&#125;);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//4.为测试类声明一个带有参数的公共构造函数，并在其中为之声明变量赋值</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">ParameterTest</span><span class="params">(String firstName, String lastName)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.firstName = firstName;</span><br><span class="line">        <span class="keyword">this</span>.lastName = lastName;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">// 5. 进行测试，发现它会将所有的测试用例测试一遍</span></span><br><span class="line">    <span class="meta">@Test</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        String name = firstName + <span class="string">&quot; &quot;</span> + lastName;</span><br><span class="line">        assertThat(<span class="string">&quot;Mike Black&quot;</span>, is(name));</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p>==核心注解二：@SpringBootTest（Classes=启动类.class）==</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 获取启动类，加载配置，确定装载 Spring 程序的装载方法，它回去寻找 主配置启动类（被 @SpringBootApplication 注解的）</span></span><br><span class="line"><span class="meta">@SpringBootTest</span></span><br><span class="line"><span class="comment">// 让 JUnit 运行 Spring 的测试环境， 获得 Spring 环境的上下文的支持</span></span><br><span class="line"><span class="meta">@RunWith(SpringRunner.class)</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">EmployeeServiceImplTest</span> </span>&#123;</span><br><span class="line">    <span class="comment">// do </span></span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>



<p>注意点：</p>
<p>1、Ctrl+Shift+T快速生成测试类</p>
<p>2、关于SpringBootTest参数省略的问题</p>
<p>如果Test测试类在主启动类所在路径的同级路径或子路径，就不需要参数，繁殖需要参数：【参数是指<code>@SpringBootTest后面的classes=主启动类.class</code>】</p>
<p>图A：需要参数</p>
<img src="/2021/12/21/SpringBoot%E6%95%99%E7%A8%8B/image-20211225131601728.png" alt="image-20211225131601728" style="zoom:50%;">

<p>图B：不需要参数</p>
<img src="/2021/12/21/SpringBoot%E6%95%99%E7%A8%8B/image-20211225131837645.png" alt="image-20211225131837645" style="zoom:50%;">



<p>==暂时不明白@RunWith有毛用？？？==</p>
<h4 id="SpringBoot整合Mybatis："><a href="#SpringBoot整合Mybatis：" class="headerlink" title="SpringBoot整合Mybatis："></a>SpringBoot整合Mybatis：</h4><p>Step：</p>
<ul>
<li>搭建SpringBoot工程</li>
<li>引入mybatis依赖，添加mysql驱动</li>
<li>编写DataSource和Mybatis相关配置</li>
<li>定义表和实体类</li>
<li>编写dao和mapper文件/纯注解开发</li>
</ul>
<p><code>依赖</code></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.mybatis.spring.boot<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>mybatis-spring-boot-starter<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>2.2.0<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>mysql<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>mysql-connector-java<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>注意：</p>
<ul>
<li><p>以spring-boot-starter开头的，是springboot官方提供的</p>
</li>
<li><p>以其他开头的，是自己写的【我们也可以自己写】</p>
</li>
</ul>
<p>配置文件：</p>
<figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">spring:</span></span><br><span class="line">  <span class="attr">datasource:</span></span><br><span class="line">    <span class="attr">url:</span> <span class="string">jdbc:mysql://localhost:3306/learnspring?characterEncoding=UTF-8&amp;useSSL=false&amp;serverTimezone=UTC</span></span><br><span class="line">    <span class="attr">username:</span> <span class="string">root</span></span><br><span class="line">    <span class="attr">password:</span> <span class="number">123456</span></span><br><span class="line">    <span class="attr">driver-class-name:</span> <span class="string">com.mysql.cj.jdbc.Driver</span></span><br></pre></td></tr></table></figure>



<ul>
<li>配置文件中url的两种写法，三斜杠貌似可以省略localhost</li>
</ul>
<figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">url:</span> <span class="string">jdbc:mysql://localhost:3306/learnspring</span></span><br><span class="line"><span class="attr">url:</span> <span class="string">jdbc:mysql:///learnspring</span></span><br></pre></td></tr></table></figure>





<h4 id="SpringBoot原理："><a href="#SpringBoot原理：" class="headerlink" title="SpringBoot原理："></a>SpringBoot原理：</h4><ul>
<li>SpringBoot自动配置</li>
<li>SpringBoot监听机制</li>
<li>SpingBoot启动流程分析</li>
</ul>
<h3 id="自动配置"><a href="#自动配置" class="headerlink" title="自动配置"></a>自动配置</h3><blockquote>
<p>Spring的自动配置：</p>
<p>原先使用Spring的时候，你为了使用某个软件包，需要自己手动配置软件包，而在springboot中，啥时候需要用了直接一个@Autowired完事！</p>
</blockquote>
<h4 id="1、Condition"><a href="#1、Condition" class="headerlink" title="1、Condition"></a>1、Condition</h4><p>Condition</p>
<p>条件判断：</p>
<ul>
<li><p>满足条件=&gt;创建bean</p>
</li>
<li><p>不满足条件=&gt;忽视</p>
</li>
</ul>
<p>案例：</p>
<blockquote>
<p>判断项目中是否有jedis组件，如果有，就创建bean，如果没有，则拒绝创建bean</p>
</blockquote>
<p><code>实体类User，没有任何注解</code></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">User</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> id;</span><br><span class="line">    <span class="keyword">private</span> String username;</span><br><span class="line">    <span class="keyword">private</span> String password;</span><br><span class="line"></span><br><span class="line">	getter &amp; setter</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><code>配置类</code></p>
<p>注意，不要在实体类上加@Repo，否则会直接创建</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserConfig</span> </span>&#123;</span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="meta">@Conditional(UserCondition.class)</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> User <span class="title">user</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> User();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><code>判断条件</code>——【其实可以以内部类的形式创建】</p>
<p>如果能找到jedis的类，则说明已经导入</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserCondition</span> <span class="keyword">implements</span> <span class="title">Condition</span> </span>&#123;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">matches</span><span class="params">(ConditionContext context, AnnotatedTypeMetadata metadata)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">boolean</span> flag = <span class="keyword">true</span>;</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            Class&lt;?&gt; redis = Class.forName(<span class="string">&quot;redis.clients.jedis.Jedis&quot;</span>);</span><br><span class="line">        &#125; <span class="keyword">catch</span> (ClassNotFoundException e) &#123;</span><br><span class="line">            flag = <span class="keyword">false</span>;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> flag;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><code>测试类</code></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@SpringBootTest</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserTest</span> </span>&#123;</span><br><span class="line">    <span class="meta">@Test</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">uTest</span><span class="params">()</span></span>&#123;</span><br><span class="line">        ConfigurableApplicationContext context = SpringApplication.run(HelloApplication.class);</span><br><span class="line">        User user = context.getBean(<span class="string">&quot;user&quot;</span>,User.class);</span><br><span class="line">        <span class="comment">// 这个context就是spring的容器</span></span><br><span class="line">        System.out.println(user);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><code>ApplicationContext就是IoC容器</code></p>
<blockquote>
<p>总结：</p>
<p>@Conditional注解是用来决定是否创建bean的</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="meta">@interface</span> Conditional &#123;</span><br><span class="line">    Class&lt;? extends Condition&gt;[] value();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>这个注解需要一个参数，类型为<code>反射类</code></p>
<p>调用形式如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Bean</span></span><br><span class="line"><span class="meta">@Conditional(UserCondition.class)</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> User <span class="title">user</span><span class="params">()</span></span>&#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">new</span> User();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>【当然也可以写在实体类上】</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Repository</span></span><br><span class="line"><span class="meta">@Conditional(UserCondition.class)</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">User</span> </span>&#123;</span><br></pre></td></tr></table></figure>

<p><code>反射类</code>需要实现Condition接口，重写matches方法</p>
<p>然后Spring根据<code>反射类</code>的结果（true/false）决定是否创建bean</p>
<p>源码分析</p>
<p><code>@Conditional</code></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="meta">@interface</span> Conditional &#123;</span><br><span class="line">    Class&lt;? extends Condition&gt;[] value();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>它需要一个继承了Condition的参数数组，当所有的返回值都为true时才创建</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Conditional(&#123;UserCondition.class, UserCondition2.class&#125;)</span></span><br></pre></td></tr></table></figure>

<p><code>Condition</code>接口，其内部有一个matches方法，就是通过该方法来决定是否创建bean</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@FunctionalInterface</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">Condition</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">boolean</span> <span class="title">matches</span><span class="params">(ConditionContext context, AnnotatedTypeMetadata metadata)</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<p>这里注意到是一个==函数式接口==，那么我们可以用lambda表达式来实现，只不过@Conditional需要一个反射类，所以还是老写法吧</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Condition condition = (ConditionContext context, AnnotatedTypeMetadata metadata) -&gt; &#123;<span class="keyword">return</span> <span class="keyword">false</span>;&#125;;</span><br></pre></td></tr></table></figure>
</blockquote>
<p>以上这个注解存在一个缺陷——无法复用</p>
<p>那么我们优化一下，自己定义一个注解，该注解的作用是判断是否存在某个类，如果存在这个类，就创建bean，否则不创建</p>
<p><code>自定义注解如下</code></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Target(&#123;ElementType.TYPE, ElementType.METHOD&#125;)</span></span><br><span class="line"><span class="meta">@Retention(RetentionPolicy.RUNTIME)</span></span><br><span class="line"><span class="meta">@Documented</span></span><br><span class="line"><span class="meta">@Conditional(UserCondition.class)</span></span><br><span class="line"><span class="keyword">public</span> <span class="meta">@interface</span> ConditionalOnClass &#123;</span><br><span class="line">    String[] value();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>==前三个元注解，还是得要，不要会出问题==</p>
<ul>
<li>@Target：作用范围</li>
<li>@Retention：作用时机</li>
<li>@Documented：生成文档</li>
<li>@Inherited：使注解在该类及其子类上发挥作用</li>
</ul>
<p>==唯一不理解的是@Conditional放在上面干嘛呢？==</p>
<p><code>重构判断条件</code></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserCondition</span> <span class="keyword">implements</span> <span class="title">Condition</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> context 上下文对象——用于获取环境，IoC容器，ClassLoader对象</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> metadata 注解元对象——用于获取注解定义的属性值</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span></span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">matches</span><span class="params">(ConditionContext context, AnnotatedTypeMetadata metadata)</span> </span>&#123;</span><br><span class="line">        Map&lt;String, Object&gt; map = metadata.getAnnotationAttributes(ConditionalOnClass.class.getName());</span><br><span class="line">        String[] value = (String[]) map.get(<span class="string">&quot;value&quot;</span>);</span><br><span class="line">        <span class="keyword">boolean</span> flag = <span class="keyword">true</span>;</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="keyword">for</span> (String s : value) &#123;</span><br><span class="line">                Class&lt;?&gt; cls = Class.forName(s);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">catch</span> (ClassNotFoundException e) &#123;</span><br><span class="line">            flag = <span class="keyword">false</span>;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> flag;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>==注意通过metadata来获取注解数据==</p>
<p>context可以用来获取环境，例如配置文件中的东西</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Environment environment = context.getEnvironment();</span><br><span class="line">environment.getProperty();</span><br></pre></td></tr></table></figure>

<p><code>使用注解</code></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Bean</span></span><br><span class="line"><span class="meta">@ConditionalOnClass(&quot;redis.clients.jedis.Jedis&quot;)</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> User <span class="title">user1</span><span class="params">()</span></span>&#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">new</span> User();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>





<p>SpringBoot中提供了大量的判断注解，当这些注解的判断成立时，才创建bean，反之不创建bean</p>
<p>在<code>spring-boot-autoconfigure</code>包的condition子包中，提供了大量的判断逻辑，如图</p>
<img src="/2021/12/21/SpringBoot%E6%95%99%E7%A8%8B/image-20211225165600817.png" alt="image-20211225165600817" style="zoom:50%;">

<p>字面意思：</p>
<p>ConditionOnBean：存在某个bean时才创建</p>
<p>ConditionOnClass：存在某个Class时才创建【和我们上面自己写的其实一样】</p>
<p>ConditionOnProperty：配置文件中配置了某属性时才创建</p>
<p>ConditionOnMissingBean：没有某个Bean时才创建</p>
<blockquote>
<p>案例：</p>
</blockquote>
<p>我们知道导入redis时，SpringBoot会自动实例化redisTemplate的对象【bean】，原理如下：</p>
<p>首先整个类必须满足存在RedisOperation类，其次还要确实redisTemplate，这样才会创建redisTemplate</p>
<img src="/2021/12/21/SpringBoot%E6%95%99%E7%A8%8B/image-20211225170049085.png" alt="image-20211225170049085" style="zoom:50%;">



<p>对于ConditionOnXXX，我们可以做如下测试：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Bean</span></span><br><span class="line"><span class="meta">@ConditionalOnProperty(name = &quot;A&quot;,havingValue = &quot;a&quot;)</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> User <span class="title">user2</span><span class="params">()</span></span>&#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">new</span> User();</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">user2Test</span><span class="params">()</span></span>&#123;</span><br><span class="line">    ConfigurableApplicationContext context = SpringApplication.run(HelloApplication.class);</span><br><span class="line">    User user = context.getBean(<span class="string">&quot;user2&quot;</span>,User.class);</span><br><span class="line">    System.out.println(user);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>此时，就必须要求配置文件有如下属性，否则无法创建</p>
<figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">A:</span> <span class="string">a</span></span><br></pre></td></tr></table></figure>



<p>疑问：类上的condition是只作用在方法上还是带上类，即类都不会被创建</p>
<p>事实证明：如果类上的ConditionOnXX不满足，整个类都不会被创建</p>
<p>更换内置web服务器</p>
<p>还是在autoConfigure包中，可以在web子包中看到各个服务器的工厂</p>
<img src="/2021/12/21/SpringBoot%E6%95%99%E7%A8%8B/image-20211225174748862.png" alt="image-20211225174748862" style="zoom:50%;">

<p><code>总类</code></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration(</span></span><br><span class="line"><span class="meta">    proxyBeanMethods = false</span></span><br><span class="line"><span class="meta">)</span></span><br><span class="line"><span class="meta">@ConditionalOnWebApplication</span></span><br><span class="line"><span class="meta">@EnableConfigurationProperties(&#123;ServerProperties.class&#125;)</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">EmbeddedWebServerFactoryCustomizerAutoConfiguration</span></span></span><br></pre></td></tr></table></figure>

<p><code>Tomcat类</code></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration(</span></span><br><span class="line"><span class="meta">    proxyBeanMethods = false</span></span><br><span class="line"><span class="meta">)</span></span><br><span class="line"><span class="meta">@ConditionalOnClass(&#123;Tomcat.class, UpgradeProtocol.class&#125;)</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">TomcatWebServerFactoryCustomizerConfiguration</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">TomcatWebServerFactoryCustomizerConfiguration</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> TomcatWebServerFactoryCustomizer <span class="title">tomcatWebServerFactoryCustomizer</span><span class="params">(Environment environment, ServerProperties serverProperties)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> TomcatWebServerFactoryCustomizer(environment, serverProperties);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>可以看到，源码中就大量使用ConditionalOnXX</p>
<p>首先必须是Web才会配置这个类，其次必须有Tomcat的类，才能注册Tomcat，由于starter-web中默认集成了Tomcat，所以Tomcat才会被注册！</p>
<p>更换方法</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework.boot<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-boot-starter-web<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">exclusions</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">exclusion</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework.boot<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-boot-starter-tomcat<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="name">exclusion</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">exclusions</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework.boot<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-boot-starter-jetty<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>





<h4 id="2、-Enable-注解"><a href="#2、-Enable-注解" class="headerlink" title="2、@Enable*注解"></a>2、@Enable*注解</h4><p>@SpringBootConfiguration：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Target(&#123;ElementType.TYPE&#125;)</span></span><br><span class="line"><span class="meta">@Retention(RetentionPolicy.RUNTIME)</span></span><br><span class="line"><span class="meta">@Documented</span></span><br><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="meta">@Indexed</span></span><br><span class="line"><span class="keyword">public</span> <span class="meta">@interface</span> SpringBootConfiguration &#123;</span><br><span class="line">    <span class="meta">@AliasFor(</span></span><br><span class="line"><span class="meta">        annotation = Configuration.class</span></span><br><span class="line"><span class="meta">    )</span></span><br><span class="line">    <span class="function"><span class="keyword">boolean</span> <span class="title">proxyBeanMethods</span><span class="params">()</span> <span class="keyword">default</span> <span class="keyword">true</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>看到其中的@Configuration了嘛，说明主启动类是一个配置类，可以在里面定义Bean等等</p>
<p>@EnableAutoConfiguration：</p>
<blockquote>
<p>@ComponentScan注解</p>
<p>作用：把符合扫描规则的类装配到spring容器中</p>
</blockquote>
<blockquote>
<p>我们通过一个例子来了解@Enable系列注解到底是干嘛的</p>
</blockquote>
<p>在原模块中引入第三方模块，那么在第三方模块注入到Spring容器中的bean能不能在主模块拿到呢？</p>
<p>引入第三方模块：</p>
<img src="/2021/12/21/SpringBoot%E6%95%99%E7%A8%8B/image-20211225214653219.png" alt="image-20211225214653219" style="zoom: 50%;">

<p>在第三方模块中，已经注入到容器中</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserConfigggg</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> Uu <span class="title">user999</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> Uu();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>导入到主模块中：</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>com.example<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>demo<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>0.0.1-SNAPSHOT<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>在主模块中引用：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 引导类：SpringBoot的项目入口</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ComponentScan</span> 只扫描主启动类所在包及其子包</span></span><br><span class="line"><span class="comment"> * 主启动类包——com.mars</span></span><br><span class="line"><span class="comment"> * 导入模块的配置类所在包——com.mars</span></span><br><span class="line"><span class="comment"> * 事实证明，还真是这样：即导入模块的包相同层级情况下会被合并，如果导入的模块的配置类所在包结构与主启动类所在包结构相同或是其子包，就可以直接被扫描，而如果不是的话，就无法被直接扫描=&gt;有以下集中解决手段</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * 现在导入模块的包结构是——com.demoo</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * 1、使用<span class="doctag">@ComponentScan</span>扫描导入模块所在包，但这样会直接把当前项目的其他包都给干不能用了，只剩下被扫描的包能用？？？</span></span><br><span class="line"><span class="comment"> * 2、使用Import注解，被注解的类都会被Spring创建，并放入IoC容器</span></span><br><span class="line"><span class="comment"> * 3、可以对Import注解进行封装，也就是我们所谓的Enable**注解</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="meta">@Import(UserConfigggg.class)</span></span><br><span class="line"><span class="meta">@SpringBootApplication</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">HelloApplication</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        ConfigurableApplicationContext context = SpringApplication.run(HelloApplication.class, args);</span><br><span class="line"></span><br><span class="line">        Object uu = context.getBean(<span class="string">&quot;user999&quot;</span>);</span><br><span class="line">        System.out.println(uu);</span><br><span class="line"></span><br><span class="line">        Object user1 = context.getBean(<span class="string">&quot;user&quot;</span>);</span><br><span class="line">        System.out.println(user1);</span><br><span class="line"></span><br><span class="line">        Object T = context.getBean(<span class="string">&quot;te&quot;</span>);</span><br><span class="line">        System.out.println(T);</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>一切都真相大白了，EnableXX注解的底层还是@Import注解</p>
<p>我们完全可以自己写一个@Enable注解</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Target(&#123;ElementType.TYPE&#125;)</span></span><br><span class="line"><span class="meta">@Retention(RetentionPolicy.RUNTIME)</span></span><br><span class="line"><span class="meta">@Documented</span></span><br><span class="line"><span class="meta">@Import(UserConfigggg.class)</span></span><br><span class="line"><span class="keyword">public</span> <span class="meta">@interface</span> EnableUu &#123; &#125;</span><br></pre></td></tr></table></figure>

<p>此时直接在主启动类上添加如下注解即可</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@EnableUu</span></span><br><span class="line"><span class="meta">@SpringBootApplication</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">HelloApplication</span> </span>&#123;&#125;</span><br></pre></td></tr></table></figure>



<blockquote>
<p>此时就可以分析@SpringBootApplication了</p>
</blockquote>
<p>@Import注解</p>
<p>@Enable*注解底层依赖于@Import注解导入一些类，使用@Import导入的类会被Spring加载到IoC容器中</p>
<p>@Import的四种用法</p>
<ul>
<li>导入Bean</li>
<li>导入配置类</li>
<li>导入ImportSelector接口的实现类。用于加载配置文件中的类</li>
<li>导入ImportBeanDefinitionRegistrar实现类【了解】</li>
</ul>
<p>代码实现：</p>
<blockquote>
<p>首先补充两个获取bean的手段</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//方式一</span></span><br><span class="line">Object obj = context.getBean(User.class);     </span><br><span class="line">System.out.println(obj);</span><br><span class="line"><span class="comment">//方式二</span></span><br><span class="line">Map&lt;String, User&gt; map = context.getBeansOfType(User.class);</span><br><span class="line">System.out.println(map);</span><br></pre></td></tr></table></figure>

<ul>
<li><p>有时候我们不知道bean的名称，但知道bean的类型，可以通过方式一获得</p>
</li>
<li><p>但方式一只能用于该类型只有一个，如果该类型的bean有多个，且我们想得知各自的名称，用方式二</p>
</li>
</ul>
<p>通过名字获得需要强转，而通过类型获得不用强转</p>
</blockquote>
<p>1、导入Bean</p>
 <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Import(Uu.class)</span></span><br><span class="line"></span><br><span class="line">Uu uu = context.getBean(Uu.class);</span><br><span class="line">System.out.println(uu);</span><br></pre></td></tr></table></figure>

<p>2、导入配置类</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Import(UserConfigggg.class)</span></span><br><span class="line"></span><br><span class="line">Uu uu = (Uu) context.getBean(<span class="string">&quot;user999&quot;</span>);</span><br><span class="line">System.out.println(uu);</span><br></pre></td></tr></table></figure>

<p> 通过Import导入配置类，配置类头上不需要写@Configuration</p>
<p>3、导入ImportSelector实现类</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Import(MyImportSelector.class)</span></span><br><span class="line"></span><br><span class="line">Uu uu = context.getBean(Uu.class);</span><br><span class="line">System.out.println(uu);</span><br></pre></td></tr></table></figure>

<p>实现类</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MyImportSelector</span> <span class="keyword">implements</span> <span class="title">ImportSelector</span> </span>&#123;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> String[] selectImports(AnnotationMetadata importingClassMetadata) &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> String[]&#123;<span class="string">&quot;com.demoo.Uu&quot;</span>&#125;;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><strong>关于ImportSelector</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">ImportSelector</span> </span>&#123;</span><br><span class="line">    String[] selectImports(AnnotationMetadata importingClassMetadata);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>可以看到，返回一个字符串数组，这个字符串数组就是将来被注入到IoC容器中的Bean</p>
<p>4、略</p>
<p>总结：</p>
<p>第三种方法就用是来完成自动注册的</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">AutoConfigurationImportSelector implements DeferredImportSelector</span><br><span class="line">    </span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">DeferredImportSelector</span> <span class="keyword">extends</span> <span class="title">ImportSelector</span>    </span></span><br></pre></td></tr></table></figure>

<p>可以看到，就是采用第三种方法来完成自动注册的</p>
<h3 id="核心原理分析"><a href="#核心原理分析" class="headerlink" title="核心原理分析"></a>核心原理分析</h3><p>最核心的就是AutoConfigurationImportSelector这个类，这个类实现了selectImports方法，这个方法的返回值就是会被SpringBoot自动注册的类</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">AutoConfigurationImportSelector</span> <span class="keyword">implements</span> <span class="title">DeferredImportSelector</span>, <span class="title">BeanClassLoaderAware</span>, <span class="title">ResourceLoaderAware</span>, <span class="title">BeanFactoryAware</span>, <span class="title">EnvironmentAware</span>, <span class="title">Ordered</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> String[] selectImports(AnnotationMetadata annotationMetadata) &#123;</span><br><span class="line">        <span class="keyword">if</span> (!<span class="keyword">this</span>.isEnabled(annotationMetadata)) &#123;</span><br><span class="line">            <span class="keyword">return</span> NO_IMPORTS;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            AutoConfigurationImportSelector.AutoConfigurationEntry autoConfigurationEntry = <span class="keyword">this</span>.getAutoConfigurationEntry(annotationMetadata);</span><br><span class="line">            <span class="keyword">return</span> StringUtils.toStringArray(autoConfigurationEntry.getConfigurations());</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>

<p>可以看到，return的是<code>autoConfiguration</code>的<code>toStringArray</code>，所以最核心的就是这个<code>autoConfiguration</code>了，我们点进去看看这个<code>getAutoConfigurationEntry</code></p>
<p>会看到如下结果，这里面最后返回的是<code>configuration</code>【和排除的】，所以我们去查看这个东西是怎么得到的，点进去看<code>getCandidateConfigurations</code></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">protected</span> AutoConfigurationImportSelector.<span class="function">AutoConfigurationEntry <span class="title">getAutoConfigurationEntry</span><span class="params">(AnnotationMetadata annotationMetadata)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (!<span class="keyword">this</span>.isEnabled(annotationMetadata)) &#123;</span><br><span class="line">        <span class="keyword">return</span> EMPTY_ENTRY;</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        AnnotationAttributes attributes = <span class="keyword">this</span>.getAttributes(annotationMetadata);</span><br><span class="line">        List&lt;String&gt; configurations = <span class="keyword">this</span>.getCandidateConfigurations(annotationMetadata, attributes);</span><br><span class="line">        configurations = <span class="keyword">this</span>.removeDuplicates(configurations);</span><br><span class="line">        Set&lt;String&gt; exclusions = <span class="keyword">this</span>.getExclusions(annotationMetadata, attributes);</span><br><span class="line">        <span class="keyword">this</span>.checkExcludedClasses(configurations, exclusions);</span><br><span class="line">        configurations.removeAll(exclusions);</span><br><span class="line">        configurations = <span class="keyword">this</span>.getConfigurationClassFilter().filter(configurations);</span><br><span class="line">        <span class="keyword">this</span>.fireAutoConfigurationImportEvents(configurations, exclusions);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> AutoConfigurationImportSelector.AutoConfigurationEntry(configurations, exclusions);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><code>getCandidateConfigurations</code></p>
<p>会看到如下结果：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">protected</span> List&lt;String&gt; <span class="title">getCandidateConfigurations</span><span class="params">(AnnotationMetadata metadata, AnnotationAttributes attributes)</span> </span>&#123;</span><br><span class="line">    List&lt;String&gt; configurations = SpringFactoriesLoader.loadFactoryNames(<span class="keyword">this</span>.getSpringFactoriesLoaderFactoryClass(), <span class="keyword">this</span>.getBeanClassLoader());</span><br><span class="line">    Assert.notEmpty(configurations, <span class="string">&quot;No auto configuration classes found in META-INF/spring.factories. If you are using a custom packaging, make sure that file is correct.&quot;</span>);</span><br><span class="line">    <span class="keyword">return</span> configurations;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>代码中提示我们，如果META-INF文件夹下没有spring.factories文件的话就会报错，同时，我们点进<code>SpringFactoriesLoader</code>中，就能看到确实是这个文件</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">final</span> <span class="class"><span class="keyword">class</span> <span class="title">SpringFactoriesLoader</span> </span>&#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">final</span> String FACTORIES_RESOURCE_LOCATION = <span class="string">&quot;META-INF/spring.factories&quot;</span>;</span><br></pre></td></tr></table></figure>



<p>那我么去看看spring.factories文件吧！</p>
<img src="/2021/12/21/SpringBoot%E6%95%99%E7%A8%8B/image-20211226135639830.png" alt="image-20211226135639830" style="zoom:50%;">

<p>我们会看到这么一条：</p>
<figure class="highlight markdown"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="section"># Auto Configure</span></span><br><span class="line">org.springframework.boot.autoconfigure.EnableAutoConfiguration=\</span><br><span class="line">org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\</span><br><span class="line">org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\</span><br><span class="line">org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration,\</span><br><span class="line">org.springframework.boot.autoconfigure.batch.BatchAutoConfiguration,\</span><br><span class="line">org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration,\</span><br><span class="line">org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration,\</span><br><span class="line">org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration,\</span><br><span class="line">org.springframework.boot.autoconfigure.context.LifecycleAutoConfiguration,\</span><br><span class="line">org.springframework.boot.autoconfigure.context.MessageSourceAutoConfiguration,\</span><br><span class="line">org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration,\</span><br><span class="line">org.springframework.boot.autoconfigure.couchbase.CouchbaseAutoConfiguration,\</span><br></pre></td></tr></table></figure>

<p>会发现这些都是什么呢——一个个配置文件啊！</p>
<p>随便点一个看看——看看我们熟悉的redis的配置文件，里面是一个个bean！而且最上面有ConditionOnClass！</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration(</span></span><br><span class="line"><span class="meta">    proxyBeanMethods = false</span></span><br><span class="line"><span class="meta">)</span></span><br><span class="line"><span class="meta">@ConditionalOnClass(&#123;RedisOperations.class&#125;)</span></span><br><span class="line"><span class="meta">@EnableConfigurationProperties(&#123;RedisProperties.class&#125;)</span></span><br><span class="line"><span class="meta">@Import(&#123;LettuceConnectionConfiguration.class, JedisConnectionConfiguration.class&#125;)</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">RedisAutoConfiguration</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">RedisAutoConfiguration</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="meta">@ConditionalOnMissingBean(</span></span><br><span class="line"><span class="meta">        name = &#123;&quot;redisTemplate&quot;&#125;</span></span><br><span class="line"><span class="meta">    )</span></span><br><span class="line">    <span class="meta">@ConditionalOnSingleCandidate(RedisConnectionFactory.class)</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> RedisTemplate&lt;Object, Object&gt; <span class="title">redisTemplate</span><span class="params">(RedisConnectionFactory redisConnectionFactory)</span> </span>&#123;</span><br><span class="line">        RedisTemplate&lt;Object, Object&gt; template = <span class="keyword">new</span> RedisTemplate();</span><br><span class="line">        template.setConnectionFactory(redisConnectionFactory);</span><br><span class="line">        <span class="keyword">return</span> template;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="meta">@ConditionalOnMissingBean</span></span><br><span class="line">    <span class="meta">@ConditionalOnSingleCandidate(RedisConnectionFactory.class)</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> StringRedisTemplate <span class="title">stringRedisTemplate</span><span class="params">(RedisConnectionFactory redisConnectionFactory)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> StringRedisTemplate(redisConnectionFactory);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>也就是说，当依赖项有redis时，即ConditionOnClass条件满足时，配置类才会被注册，配置类里面的bean才有注册的可能！而具体情况，还要看各个bean的Condition条件</p>
<p>至此，真相大白！</p>
<p>SpringBoot自动配置的原理就是：</p>
<p>在spring.factories文件中写好各个要用的配置类，当SpringBoot项目启动时，通过EnableAutoConfiguration注解，本质是通过import注解导入各个配置类，而各个配置类根据自己的启动条件判断是否启动！</p>
<img src="/2021/12/21/SpringBoot%E6%95%99%E7%A8%8B/image-20211226140821925.png" alt="image-20211226140821925" style="zoom:50%;">



<p>自己写一个starter，注意点：</p>
<ul>
<li><p>@ConfigurationProperties（prefix=”redis”）注解：可以把实体类和配置文件绑定，就能读取到配置文件的东西了</p>
<blockquote>
<figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="string">redis.port</span> <span class="string">=</span> <span class="number">8888</span></span><br></pre></td></tr></table></figure>

<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">private</span> <span class="keyword">int</span> port = <span class="number">6379</span>;<span class="comment">//默认6379，配置了上面之后就变成8888</span></span><br></pre></td></tr></table></figure></blockquote>
</li>
<li><p>@ConditionOnClass注解：只有当有这些类的时候，才让配置类生效</p>
</li>
<li><p>@ConditionOnMissingBean注解：如果用户自己定义了该名字的bean，就用用户的，不用自己的</p>
</li>
</ul>
<h3 id="SpringBoot监听机制"><a href="#SpringBoot监听机制" class="headerlink" title="SpringBoot监听机制"></a>SpringBoot监听机制</h3><h3 id="SpringBoot启动流程"><a href="#SpringBoot启动流程" class="headerlink" title="SpringBoot启动流程"></a>SpringBoot启动流程</h3><h3 id="SpringBooot部署"><a href="#SpringBooot部署" class="headerlink" title="SpringBooot部署"></a>SpringBooot部署</h3><h3 id="SpringBoot整合SpringSecurity"><a href="#SpringBoot整合SpringSecurity" class="headerlink" title="SpringBoot整合SpringSecurity"></a>SpringBoot整合SpringSecurity</h3><p>在web开发中，安全位于第一位！过滤器，拦截器等等</p>
<p>安全应该在设计之初就考虑</p>
<ul>
<li>Shiro</li>
<li>SpringSecurity</li>
</ul>
<p>认证：判断你是不是你</p>
<p>授权：VIP等级</p>
<ul>
<li><p>功能权限：</p>
</li>
<li><p>访问权限：</p>
</li>
<li><p>菜单权限：</p>
</li>
<li><p>拦截器、过滤器等……</p>
</li>
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                    <ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link"><span class="toc-number">1.</span> <span class="toc-text"></span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#SpringBoot%E6%95%99%E7%A8%8B"><span class="toc-number">1.1.</span> <span class="toc-text">SpringBoot教程</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%A1%A5%E5%85%85%EF%BC%9A%E5%85%B3%E4%BA%8E%E6%B3%A8%E8%A7%A3"><span class="toc-number">1.1.1.</span> <span class="toc-text">补充：关于注解</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#0%E3%80%81%E5%89%8D%E8%A8%80"><span class="toc-number">1.1.2.</span> <span class="toc-text">0、前言</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1%E3%80%81SpringBoot%E7%AE%80%E4%BB%8B"><span class="toc-number">1.1.3.</span> <span class="toc-text">1、SpringBoot简介</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2%E3%80%81%E5%BE%AE%E6%9C%8D%E5%8A%A1%E6%9E%B6%E6%9E%84"><span class="toc-number">1.1.4.</span> <span class="toc-text">2、微服务架构</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#3%E3%80%81%E7%AC%AC%E4%B8%80%E4%B8%AASpringBoot%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F"><span class="toc-number">1.1.5.</span> <span class="toc-text">3、第一个SpringBoot应用程序</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#4%E3%80%81%E5%8E%9F%E7%90%86%E5%88%9D%E6%8E%A2"><span class="toc-number">1.1.6.</span> <span class="toc-text">4、原理初探</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%90%AF%E5%8A%A8%E5%99%A8%EF%BC%9A"><span class="toc-number">1.1.6.1.</span> <span class="toc-text">启动器：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E4%B8%BB%E7%A8%8B%E5%BA%8F"><span class="toc-number">1.1.6.2.</span> <span class="toc-text">主程序</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#SpringApplication"><span class="toc-number">1.1.6.3.</span> <span class="toc-text">SpringApplication</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#5%E3%80%81yaml%E9%85%8D%E7%BD%AE"><span class="toc-number">1.1.7.</span> <span class="toc-text">5、yaml配置</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%A4%9A%E7%8E%AF%E5%A2%83%E9%85%8D%E7%BD%AE"><span class="toc-number">1.1.7.1.</span> <span class="toc-text">多环境配置</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#6%E3%80%81SpringBoot-WEB%E5%BC%80%E5%8F%91"><span class="toc-number">1.1.8.</span> <span class="toc-text">6、SpringBoot WEB开发</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E9%9D%99%E6%80%81%E8%B5%84%E6%BA%90"><span class="toc-number">1.1.8.1.</span> <span class="toc-text">静态资源</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%A8%A1%E6%9D%BF%E5%BC%95%E6%93%8E-Thymeleaf"><span class="toc-number">1.1.9.</span> <span class="toc-text">模板引擎-Thymeleaf</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#7%E3%80%81Demo"><span class="toc-number">1.1.10.</span> <span class="toc-text">7、Demo</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#SpringBoot%E9%87%8D%E6%9E%84"><span class="toc-number">1.2.</span> <span class="toc-text">SpringBoot重构</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#0%E3%80%81%E5%A4%8D%E4%B9%A0Spring"><span class="toc-number">1.2.1.</span> <span class="toc-text">0、复习Spring</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#0-1-Bean%E7%9A%84%E8%87%AA%E5%8A%A8%E8%A3%85%E9%85%8D"><span class="toc-number">1.2.1.1.</span> <span class="toc-text">0.1 Bean的自动装配</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#0-2-%E6%B3%A8%E8%A7%A3%E5%AE%9E%E7%8E%B0%E8%87%AA%E5%8A%A8%E8%A3%85%E9%85%8D"><span class="toc-number">1.2.1.2.</span> <span class="toc-text">0.2 注解实现自动装配</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#0-3-%E6%B3%A8%E8%A7%A3%E5%BC%80%E5%8F%91"><span class="toc-number">1.2.1.3.</span> <span class="toc-text">0.3 注解开发</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E9%85%8D%E7%BD%AE%E7%B1%BB%EF%BC%9A%E4%BD%BF%E7%94%A8java%E7%9A%84%E6%96%B9%E5%BC%8F%E9%85%8D%E7%BD%AESpring%E3%80%90%E5%9C%A8springboot%E4%B8%AD%E5%A4%A7%E9%87%8F%E4%BD%BF%E7%94%A8%E3%80%91"><span class="toc-number">1.2.1.4.</span> <span class="toc-text">配置类：使用java的方式配置Spring【在springboot中大量使用】</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%80%BB%E7%BB%93Spring%E6%B3%A8%E5%85%A5%E5%88%B0%E5%AE%B9%E5%99%A8%E4%B8%AD%E7%9A%84%E5%87%A0%E7%A7%8D%E6%96%B9%E5%BC%8F"><span class="toc-number">1.2.2.</span> <span class="toc-text">总结Spring注入到容器中的几种方式</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#SpringBoot%EF%BC%81%E3%80%90%E8%A1%A5%E7%8B%82%E7%A5%9E%E7%9A%84shiro%E5%92%8C%E5%AE%9A%E6%97%B6%E5%99%A8%E3%80%91devtools"><span class="toc-number">1.3.</span> <span class="toc-text">SpringBoot！【补狂神的shiro和定时器】devtools</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#SpringBoot%E6%A0%B8%E5%BF%83%E6%80%9D%E6%83%B3"><span class="toc-number">1.3.0.1.</span> <span class="toc-text">SpringBoot核心思想</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#SpringBoot%E5%BF%AB%E9%80%9F%E5%85%A5%E9%97%A8"><span class="toc-number">1.3.0.2.</span> <span class="toc-text">SpringBoot快速入门</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%B5%B7%E6%AD%A5%E4%BE%9D%E8%B5%96%E5%8E%9F%E7%90%86%E5%88%86%E6%9E%90%EF%BC%9A"><span class="toc-number">1.3.0.3.</span> <span class="toc-text">起步依赖原理分析：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#Profiles%E9%85%8D%E7%BD%AE"><span class="toc-number">1.3.0.4.</span> <span class="toc-text">Profiles配置</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%86%85%E9%83%A8%E6%96%87%E4%BB%B6%E9%85%8D%E7%BD%AE%E9%A1%BA%E5%BA%8F%EF%BC%9A%E8%A7%81%E4%B8%8A"><span class="toc-number">1.3.0.5.</span> <span class="toc-text">内部文件配置顺序：见上</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%A4%96%E9%83%A8%E6%96%87%E4%BB%B6%E9%85%8D%E7%BD%AE%E9%A1%BA%E5%BA%8F%EF%BC%9A"><span class="toc-number">1.3.0.6.</span> <span class="toc-text">外部文件配置顺序：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#springboot%E6%95%B4%E5%90%88%E5%8D%95%E5%85%83%E6%B5%8B%E8%AF%95"><span class="toc-number">1.3.0.7.</span> <span class="toc-text">springboot整合单元测试</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#SpringBoot%E6%95%B4%E5%90%88Mybatis%EF%BC%9A"><span class="toc-number">1.3.0.8.</span> <span class="toc-text">SpringBoot整合Mybatis：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#SpringBoot%E5%8E%9F%E7%90%86%EF%BC%9A"><span class="toc-number">1.3.0.9.</span> <span class="toc-text">SpringBoot原理：</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%87%AA%E5%8A%A8%E9%85%8D%E7%BD%AE"><span class="toc-number">1.3.1.</span> <span class="toc-text">自动配置</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1%E3%80%81Condition"><span class="toc-number">1.3.1.1.</span> <span class="toc-text">1、Condition</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2%E3%80%81-Enable-%E6%B3%A8%E8%A7%A3"><span class="toc-number">1.3.1.2.</span> <span class="toc-text">2、@Enable*注解</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%A0%B8%E5%BF%83%E5%8E%9F%E7%90%86%E5%88%86%E6%9E%90"><span class="toc-number">1.3.2.</span> <span class="toc-text">核心原理分析</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#SpringBoot%E7%9B%91%E5%90%AC%E6%9C%BA%E5%88%B6"><span class="toc-number">1.3.3.</span> <span class="toc-text">SpringBoot监听机制</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#SpringBoot%E5%90%AF%E5%8A%A8%E6%B5%81%E7%A8%8B"><span class="toc-number">1.3.4.</span> <span class="toc-text">SpringBoot启动流程</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#SpringBooot%E9%83%A8%E7%BD%B2"><span class="toc-number">1.3.5.</span> <span class="toc-text">SpringBooot部署</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#SpringBoot%E6%95%B4%E5%90%88SpringSecurity"><span class="toc-number">1.3.6.</span> <span class="toc-text">SpringBoot整合SpringSecurity</span></a></li></ol></li></ol></li></ol>
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      content: false
      slug: false
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      link: false
      permalink: false
      excerpt: false
      categories: false
      tags: true
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        </ul>
    	</section>
    

    

    
    	<section class="tools-section tools-section-me" q-show="aboutme">
  	  	
  	  		<div class="aboutme-wrap" id="js-aboutme">很惭愧&lt;br&gt;&lt;br&gt;只做了一点微小的工作&lt;br&gt;谢谢大家</div>
  	  	
    	</section>
    
  </div>
  
</div>
    <!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">

    <!-- Background of PhotoSwipe. 
         It's a separate element as animating opacity is faster than rgba(). -->
    <div class="pswp__bg"></div>

    <!-- Slides wrapper with overflow:hidden. -->
    <div class="pswp__scroll-wrap">

        <!-- Container that holds slides. 
            PhotoSwipe keeps only 3 of them in the DOM to save memory.
            Don't modify these 3 pswp__item elements, data is added later on. -->
        <div class="pswp__container">
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
        </div>

        <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
        <div class="pswp__ui pswp__ui--hidden">

            <div class="pswp__top-bar">

                <!--  Controls are self-explanatory. Order can be changed. -->

                <div class="pswp__counter"></div>

                <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>

                <button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>

                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                <!-- element will get class pswp__preloader--active when preloader is running -->
                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                      <div class="pswp__preloader__cut">
                        <div class="pswp__preloader__donut"></div>
                      </div>
                    </div>
                </div>
            </div>

            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div> 
            </div>

            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>

            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>

            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>

        </div>

    </div>

</div>
  </div>
</body>
</html>